7，The search proved difficult.

这个语境中：search=hunt

8， Wherever it went, it left behind it a trail of dead deer and small animals like rabbits.

leave behind: 把某物留在后面

9， A businessman on a fishing trip saw the puma up a tree.

on + 名词：强调动作正在进行

on the rise:在上升

on the increase: 在增加

on the watch: 在观看

on the match:在比赛中

on the fishing trip:在钓鱼的途中

on holiday: 在度假

10，The experts were now fully convinced that the animal was a puma.

fully: completely, entirely

11，This one must have been in the possession of a private collector.

in the possession of sb==in sb's possession 归某人所有

in possession of sth. 拥有某物

take possession of 拥有

tip: 请大家体会下同种意思的不同表达，让我们的语言丰富起来！

eg: The beautiful car is in my possession / in the possession of me.

I am in possession of the beautiful car.

The person in possession of the big house is excited.

12， It is disturbing to think that a dangerous wild animal is still at large in the quiet countryside.

It is disturbing to think that 一想到.........就心里不安

key structure & grammar

1. simple sentence, compound sentence and complex sentence(check NCE2 L73)

本文主要有复杂句组成，复杂句是由简单句构成的，分析复杂句的意思：

1）先看句子由几个部分组成；

2）通过link word来判断主从句关系；

e.g. However, as the evidence began to accumulate, experts from the Zoo felt obliged to investigate, for the descriptions given by people who claimed to have seen the puma were extraordinarily similar.

分句1：The evident began to accumulate.

as 表示伴随主句同时发生的状态

主句：Experts from the Zoo felt obliged to investigate.新概念美音版

tip: 在阅读中，先看主句有助于全文理解和提高阅读效率。

分句2：The descriptions given by people who claimed to have seen the puma were extraordinarily similar.

for 表示原因，翻译做：因为

这个分句还可以再细分：

句子的主干部分是：The descriptions were similar

given引导的部分是过去分词作定语，修饰description

而这一成分中，who引导的定语从句，用来修饰people